WO1998031011A2 - Multi-surfaced, single sided optical disc - Google Patents
Multi-surfaced, single sided optical disc Download PDFInfo
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- WO1998031011A2 WO1998031011A2 PCT/US1998/000348 US9800348W WO9831011A2 WO 1998031011 A2 WO1998031011 A2 WO 1998031011A2 US 9800348 W US9800348 W US 9800348W WO 9831011 A2 WO9831011 A2 WO 9831011A2
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- storage medium
- data storage
- layer
- light
- thin film
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/256—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers improving adhesion between layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/127—Lasers; Multiple laser arrays
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/2571—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 14 elements except carbon (Si, Ge, Sn, Pb)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25711—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing carbon
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25713—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing nitrogen
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25715—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing oxygen
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B7/2572—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B7/2572—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials
- G11B7/2575—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of organic materials resins
Definitions
- This invention relates to optical storage media, specifically compact discs that contain more than one data recording surface readable from a single side of the disc.
- Compact discs are typically composite objects having a series of pits impressed into a plastic surface, usually during an injection molding process. These pits and the lands between them are arranged in a spiral pattern that can be tracked by a pickup laser beam which advances slowly along a radius of the disc while the disc is spun about an axis through the center of the disc. The pit/land surface is coated with a thin reflective metal layer. The pickup laser beam is reflected from the metal layer coating the pits and lands and the reflection is analyzed to observe the change in reflection intensity associated with a transition from a land to a pit or vice versa. To enhance the change in reflection intensity the wavelength of light is chosen to cause interference when the laser illuminates a pit.
- the interference occurs between laser light reflected from the bottom of a pit and light reflected from the areas outside the pits struck by the laser light. Therefore the wave- length of light is not chosen arbitrarily, but is typically related to the depth of the pits.
- the length of the pit and or land as it passes under the pickup laser is sensed by photocells and is then interpreted by the CD player's electronics.
- Data is encoded onto the compact disc as varying lengths of the pits and lands.
- the data may be analog or digital data.
- a voltage level may correspond to a pit length in an analogue recording, or the length of the pits/lands may represent strings of O's or l's for the recording of digital data.
- the amount of data that can be encoded onto a disc is limited by the density of pits and lands that can be accurately reproduced, for example by an injection molding pro- cedure, and that can be accurately read by a photocell sensor system. Some error rate can be tolerated if the data is placed on the disc in a redundant format that allows errors to be recognized and corrected. Thus as the pits and lands are decreased in size it becomes necessary as a practical matter to provide greater redundancy in the data until a limit is reached in the amount of data that can be stored on the disc surface.
- the conventional audio compact disc stored data that was readable from only one side, the other side being used to display a label over the surface of the disc.
- Double sided discs have been made by fabricated two half thickness compact discs and bonding them back to back.
- One drawback of such a product is that the disc must be removed from the player and inverted if there is only one pickup laser reading head within the player, or multiple reading heads must be provided.
- the present invention avoids the need for either multiple reading heads or disc inversion.
- a CD format using a reading beam of shorter than conventional wavelength (650 nm v. 780 nm) called DVD has been proposed. Discs for this new format would not be readable by conventional CD players.
- the present invention provides a way to have an optical disc medium readable by both (conventional) CD and DVD players.
- the present invention provides a double surfaced (or higher multiple surfaced) data storing compact disc for optically recorded data.
- the data surfaces (one for convention CD, one for DVD) are separated by a thin film of wavelength sensitive material that passes light of one frequency and reflects light of a second (or multiple) freguency.
- the thin film may provide this effect by passively relying upon the inherent interference between light signals reflected from the upper and lower surfaces of the film.
- the thin film may be fabricated from an active material that receives light of one frequency and depending upon that freguency remits light of a second frequency. Filtering optics can then distinguish the light reflected from the data surfaces.
- a further aspect of the present invention is the method for the manufacture of such a multi-surfaced disc.
- the invention is a combination of the technologies of compact disc manufacture and thin film technology.
- One advantage of the present invention is greater information storage on a single disc.
- a second advantage is that by providing a disc with two different data formats it may allow backwards compatibility during introduction of a new DVD format.
- Figure 1 is a schematic representation of the reflection of light from a thin film.
- Figure 2 is a side cut away view showing the data recording surfaces of the present in- vention.
- Figure 3 is a further embodiment in which the wavelength selectable thin film comprises the adhesive bonding the CD and DVD surfaces together.
- Figure 4 is a structural diagram of a preferred thin film material.
- Figure 5 is a schematic view of an alternative embodiment of the present invention employing multiple data surfaces.
- FIG. 1 shows the reflection of parallel rays of light from two surfaces of a thin film.
- the light is shown in non-normal incidence for purposes of clarity, but in practice the light is normally incident on the film.
- the phase change of the ray that takes the longer path by reflection from the upper surface is 27r(2d i / ⁇ i ) + [ ⁇ ] , where the [ ⁇ ] term is included if the light is reflected from a surface having a lesser index of refraction than the material through which it is propagating.
- the index i identifies the layer where the reflection takes place in the event that there is more than one such layer.
- any thin film of proper thickness and index of refraction has wavelength selective properties.
- a thin film coating is used to select between the different wave- lengths of the pickup lasers.
- Figure 2 depicts a cross section (not to scale) through a portion of the compact disc of the present invention.
- the pits and lands are present on two levels.
- the upper level pits and lands .11 are formed on a PCV or polycarbonate vinyl flat surface termed the CD .13., because of its resemblance to conventional audio or CD-ROM surfaces. It is coated with a metallization layer 15_ to enhance the reflectivity of light entering from below.
- the depths of the pits on the CD layer are such as to enhance interference effects when 780 nm radiation is incident on the pit/land surface.
- the lower level pits and lands 1 are formed on a PCV flat surface termed the DVD 19.
- the lower level pits and lands are coated with a wavelength selective reflection layer 21, also referred to as a thin film layer, thereby complet-ing the formation of the DVD.
- a wavelength selective reflection layer 21 also referred to as a thin film layer
- Both the DVD and the CD layers have preferred thicknesses of 0.6 mm.
- the two layers are adhered together by an bonding layer 2J3, which may be a transmissive photo polymer layer having a thickness of 30-40 ⁇ .
- the adhesive material may itself constitute the wavelength selective thin film.
- the thin film layer 1 is reflective to wavelengths of 650 nm and transmissive to infrared wavelengths of 780 nm.
- the wavelength selection is a function of the thin film nature of the sputtered material and not any particular active feature of the silicon material.
- the DVD layer 19 comprises a dye polymer layer 2L, which is over 85% transmissive to 780 nm light and over 15% reflective to 650 nm light.
- the CD layer is conventionally coated (metallized) for maximum reflectivity of over 90%.
- the relative efficiency of the reflectivity of the 780 nm material is 70%.
- the data density of the DVD layer may be reduced to 4.5 gigabytes to assure adequate signal to noise ratio.
- the dye may be selected from a group that are transmissive at 780 nm and reflective at 650 nm.
- This dyes include the anthraquinones, such as D&C green 6 (1,4- di(p-toluidine)anthraquinone) available from Crompton & Knowles, and solvent green 6, available from Pylam.
- Other useable dyes are Chlorantine Fast Blue 4GL and diphenylmethine dyes such as Michler's hydrol. The structural diagrams for these preferred dyes are shown in Figure 4.
- the dye is dissolved in USP No. 10 mineral oil and then spin-cast onto the surface of the disc prior to adding the adhesive.
- the mineral oil is preferred because it is transparent at the wave- lengths of interest and will flow evenly into the imprinted grooves of the disc due to its low viscosity.
- An alternative technique to spin- casting a thin layer of the dye onto the disc is to use a solvent such as butane that could be flashed evaporated. In this process, rapid heating of the solvent would leave the dye be- hind on the surface of the disc.
- a strong adhesive for polycarbonate such as pure paraffin or micro-crystalline waxes. These have a melting temperature around 80°C and readily "wet" the surface of polycarbonate. In addition to their adhesive strengths, any residual hydrocarbon solvent used for dissolving the dye would be absorbed by these waxes and would concentrate the D&C green 6 into a very compact reflective layer at the surface of the disc.
- EVA ethylene vinyl acetate
- a small percentage of ethylene vinyl acetate (EVA) (10%) should be added to the paraffin wax melt, to increase the high temperature tensile strength and low temperature flexibility of the product. Adding more than 10% of EVA to the paraffin wax may cause cloud point dispersion of the light beam, which might diminish the signal intensity.
- a semiconductor may be used to bring about the desired wavelength selectivity.
- the preferred semiconductor is a (GaAs) 6 (GaP) 4 stoichiometric III-V semicon- ductor.
- the index of refraction of this material is about 3.5, so the reflectivity is measurable at 650 nm.
- the index of refraction of the polycarbonate is 1.5.
- the CD/DVD technology requires a material with a very sharp change in the transmissivity at about 700 nm. This requires a change of the absorption coefficient by orders of magnitude in the immediate vicinity of 700 nm. This is satisfied by semiconducting materials with band gap energies of approximately 1.7 eV.
- the sharpness of the transmissivity has been evaluated from the wave- length dependence of the absorption coefficient, which shows that the absorption coefficient can change by about 5 orders of magnitude over a 100 nm wavelength band centered about 700 nm. At 650 nm the internal transmissivity is negligibly small. At 780 nm the internal transmissivity is 100%. The reflectivity at 780 nm is in excess of 10%, since the refractive index generally decreases with increasing wavelength. To achieve larger reflectivity than 10% at
- a very thin (about 10 nm) partially reflective chromium layer can be deposited on the polycarbonate prior to depositing the 40 ⁇ m GaAsP layer.
- Increasing the reflectivity to specifications at 650 nm with a partially transmissive chromium layer will have an attenuating effect on the transmissive behavior at 780 nm.
- a beneficial side-effect of employing chromium as a reflectivity agent is that it may also be strong bonding agent between the polycarbonate and the GaAsP.
- Other materials having a band gap energy at 1.7 eV is the II-VI binary compound CdSe. However its index of refraction is about 2.5, making it less suitable.
- ternary and quaternary III-V compound semiconductors exist whose binary compound components are mutually soluble in each other and whose compositions can be adjusted to achieve a 1.7 EV band gap energy.
- the ternary (GaAs) 1 . ⁇ (AlAs) ⁇ compounds represent alternative possibilities to the preferred GaAsP system.
- a still further preferred embodiment employs a liquid crystal polymer (LCP) .
- LCPs are polymers whose optical properties are controlled by the molecular structure and the post-reactor processing involving thermal, mechanical and electrical energy. The optical properties are also changed by processing the polymer by itself or with other polymers.
- LCP's have been used for a wide variety of optical devices. These include switchable optical recording medium, gas flow optical indicator, light modulators, shutters and valves, amplitude intensifying optical filters, wave plate for 1054 nm laser, optical bandpass filter, multipage optical display as well as other applications.
- LCPs have been applied as films and as dispersions in other polymers including polycarbonate.
- the composite is a polymer dispersed liquid crystal or PDLC.
- the PDLC contains "droplets" of the LCP. The size, pitch and spatial orientation of these droplets provide yet another way of controlling the optical properties of the poly- mer-LCP composite.
- a copolyamide of nylon 6 and nylon 66 with the trade name Utramid is supplied by BASF. This contains no chopped glass reinforcing fibers, so it is useful for optical applications.
- the general method of dispensing LCPs in host polymers is by extrusion. Such dispersion can be done prior to and independent of the present manufacturing line.
- FIG. 5 A still further preferred embodiment is shown in Figure 5.
- a multilayered example of the present invention is depicted in which there are more that two data recording surfaces.
- a particular utility for this invention is to provide a single compact disc that is readable both on a conventional CD player (where the data is read using the longer wavelength light that passes through the DVD layer) and on a DVD format player.
- the DVD player requires a thinner plastic layer that allows the DVD data surface to be closer to the pickup laser. This is accomplished by the present invention where, as shown in Fig. 2, the DVD layer is closer to the pickup optics.
- the CD player which can tolerate a greater displacement between the pickup optics and the data surface is the surface further removed from the pickup optics. In this manner, a disc may be prepared which could be used with either a CD or DVD player by having data for the corresponding player on the corresponding layer.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU58190/98A AU5819098A (en) | 1997-01-10 | 1998-01-09 | Multi-surfaced, single sided optical disc |
EP98901739A EP0928482A4 (en) | 1997-01-10 | 1998-01-09 | Multi-surfaced, single sided optical disc |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/782,555 | 1997-01-10 | ||
US08/782,555 US6160787A (en) | 1996-01-11 | 1997-01-10 | Multiple layer optical recording medium for use with two different wavelength laser beams |
Publications (2)
Publication Number | Publication Date |
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WO1998031011A2 true WO1998031011A2 (en) | 1998-07-16 |
WO1998031011A3 WO1998031011A3 (en) | 1998-11-12 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/000348 WO1998031011A2 (en) | 1997-01-10 | 1998-01-09 | Multi-surfaced, single sided optical disc |
Country Status (4)
Country | Link |
---|---|
US (1) | US6160787A (en) |
EP (1) | EP0928482A4 (en) |
AU (1) | AU5819098A (en) |
WO (1) | WO1998031011A2 (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1162614A2 (en) * | 2000-06-09 | 2001-12-12 | TDK Corporation | Optical information medium |
WO2004008446A2 (en) * | 2002-07-11 | 2004-01-22 | Glud & Marstrand A/S | A compensated optical storage medium |
WO2006080964A1 (en) * | 2005-01-25 | 2006-08-03 | Thomson Licensing | High density, hybrid optical disc |
US7094364B2 (en) | 2003-11-26 | 2006-08-22 | General Electric Company | Method of authenticating polymers, authenticatable polymers, methods of making authenticatable polymers and authenticatable articles, and articles made there from |
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Also Published As
Publication number | Publication date |
---|---|
US6160787A (en) | 2000-12-12 |
WO1998031011A3 (en) | 1998-11-12 |
EP0928482A4 (en) | 2002-04-17 |
AU5819098A (en) | 1998-08-03 |
EP0928482A2 (en) | 1999-07-14 |
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